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The difference between isotopes is due to the number of:
ANucleons
BNucleotides
CNucleoli
DNeutrons
Answer & Solution
Correct answer: D. Neutrons
1. The atomic number, and so the proton count, is the same.
2. The difference is due to a different number of neutrons in the nucleus.
3. So the correct answer is neutrons.
_Source: syllabus Chemistry, Ch 2 'Structure of Atom'_
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